$A$ mass $m$ is suspended by means of two coiled springs which have the same length in the unstretched condition,as shown in the figure. Their force constants are $k_1$ and $k_2$ respectively. When set into vertical vibrations,the period will be:
- A$2\pi \sqrt{\frac{m}{k_1 k_2}}$
- B$2\pi \sqrt{m \frac{k_1}{k_2}}$
- C$2\pi \sqrt{\frac{m}{k_1 - k_2}}$
- D$2\pi \sqrt{\frac{m}{k_1 + k_2}}$
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